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For months, we were warned against the dangers of theCOVID asymptomatic propagationBut we did not win a lot of an understanding of the reasons why some people do not have symptoms while others suffer from complications threatening vital prognosis. Experts believe that near40 percent of coronavirus cases are asymptomatic, but why is this number so high? According toThe New York Times,A recent study published byNature cites "a level ofpre-existing immunity"As a potential factor why some people do not have coronavirus symptoms.

According to the study, you can thank the T cells for mitigatingSymptoms of coronavirus In many people. memory cells t protect againstpathogens encountered before (Like viruses), according to theNature. The study focused on three different groups and found that "in one, each of the 36 people exposed to the new virus had T lymphocytes that recognize a protein that resembles all coronaviruses. In another, 23 people infected with the SARS virus in 2003 also had these T cells, as 37 people did in the third group that were forever exposed these two pathogens ", according toThe New York Times. These results led the researchers to hypothesize thatImmunity in Covid-19 Perhaps more widespread than originally thought.

"A pre-existing level of immunity against SARS-COV2 seems to exist in the general population,"Antonio Beroletti, MD, one of the researchers of the study, saidThe New York Times. This immunity could come from an earlier exhibition with coronaviruses that cause more banal diseases such as thecommon cold, According to the study. Although these T cells can not be strong enough to prevent someone from contracting Covid-19, they might explain why so many cases are asymptomatic or generate benign symptoms.

A study published by May soonerCell found that there were people who possessed T cells that recognize Covid-19 antigens, although they ever had Covid-19, SARS or MERS. This study suggested "a cross reactionT cell recognition Between the circulation "cold" coronavirus and the SARS-COV-2 ", which would allow some of the population to have a certain level of pre-existing immunity. Recent studyNature seems to continue this theory.

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These new results help to understand the experts of cases and the symptoms vary enormously coronavirus that we see around the world. Learn how T cells interact with the virus helps doctors and scientists go to a better understanding of the virus and theThe development of a vaccine. And to learn more about the future of coronavirus,Dr. Fauci just says the words on Covid-19 you never wanted Hear.